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The 50,8mm visual back is used to connect eyepieces, cameras or other accessories that have a 50,8mm barrel. On the other side there is a M48 thread. For example, it is useful when you need to insert an eyepiece or a star diagonal.
This visual back is 49mm high and inside it has a brass ring to avoid damaging the inserted accessory that is blocked with 1 screw. It offers a M48 female thread useful to connect other accessories with M48 male thread.